Yep, I've been walking less since retaking up bike commuting in '08. Prior to that I was walking 3+ mi/day mainly for exercise. A few months later the average was probably 1 mi/day.
My chiropractor commented that I needed to walk more. So I started to walk at lunch. Then work moved and I'm averaging 1.5 daily walking at work. Then either golf or a little hiking on the weekends.